21422615231 has 2 divisors, whose sum is σ = 21422615232. Its totient is φ = 21422615230.

The previous prime is 21422615213. The next prime is 21422615243. The reversal of 21422615231 is 13251622412.

Together with previous prime (21422615213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21422615231 - 2³⁰ = 20348873407 is a prime.

It is a super-2 number, since 2×21422615231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21422615194 and 21422615203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21422615261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711307615 + 10711307616.

It is an arithmetic number, because the mean of its divisors is an integer number (10711307616).

Almost surely, 2^21422615231 is an apocalyptic number.

21422615231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422615231 is an equidigital number, since it uses as much as digits as its factorization.

21422615231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 29.

The spelling of 21422615231 in words is "twenty-one billion, four hundred twenty-two million, six hundred fifteen thousand, two hundred thirty-one".